Determine the missing ninth digit for the ISBN 0-7167-108_-2.
A) 2
B) 5
C) 6
D) 9

Question

Quizplus · Accepted Answer

The ISBN number has 10 digits and the ninth digit is a check digit which is calculated using a specific formula. By applying the formula, it can be determined that the missing digit should be 6. This is because the last digit of the sum of the first 8 digits multiplied by their respective weights should be the same as the missing check digit. Therefore, the correct ISBN number is 0-7167-1086-2.

Determine the Missing Ninth Digit for the ISBN 0-7167-108_-2